package game.util.timer;

import java.util.Set;
import java.util.concurrent.TimeUnit;

/**
 * Schedules {@link TimerTask}s for one-time future execution in a background thread.
 * 
 * @apiviz.landmark
 * @apiviz.has org.jboss.netty.util.TimerTask oneway - - executes
 * @apiviz.has org.jboss.netty.util.Timeout oneway - - creates
 */
public interface Timer {

	/**
	 * Schedules the specified {@link TimerTask} for one-time execution after the specified delay.
	 * 
	 * @return a handle which is associated with the specified task
	 * 
	 * @throws IllegalStateException
	 *             if this timer has been {@linkplain #stop() stopped} already
	 */
	Timeout newTimeout(TimerTask task, long delay, TimeUnit unit);

	/**
	 * Releases all resources acquired by this {@link Timer} and cancels all tasks which were scheduled but not executed yet.
	 * 
	 * @return the handles associated with the tasks which were canceled by this method
	 */
	Set<Timeout> stop();

	/**
	 * 以秒为单位
	 * 
	 * @param task
	 * @param delay
	 * @return
	 */
	Timeout newTimeout(TimerTask task, int delay);
}
